[1] : The Collaborative International Dictionary of English v.0.48

gas \gas\ ga^s, n.; pl. gases ga^s"e^z. invented by
   the chemist van helmont of brussels, who died in 1644.
   1. an a"eriform fluid; -- a term used at first by chemists
      as synonymous with air, but since restricted to fluids
      supposed to be permanently elastic, as oxygen, hydrogen,
      etc., in distinction from vapors, as steam, which become
      liquid on a reduction of temperature. in present usage,
      since all of the supposed permanent gases have been
      liquified by cold and pressure, the term has resumed
      nearly its original signification, and is applied to any
      substance in the elastic or a"eriform state.
      1913 webster

   2. popular usage
      a a complex mixture of gases, of which the most
          important constituents are marsh gas, olefiant gas,
          and hydrogen, artificially produced by the destructive
          distillation of gas coal, or sometimes of peat, wood,
          oil, resin, etc. it gives a brilliant light when
          burned, and is the common gas used for illuminating
          purposes.
      b laughing gas.
      c any irrespirable a"eriform fluid.
          1913 webster

   3. same as gasoline; -- a shortened form. also, the
      accelerator pedal of a motor vehicle; used in the term "
      step on the gas".
      pjc

   4. the accelerator pedal of a motor vehicle; used in the term
      " step on the gas".
      pjc

   5. same as natural gas.
      pjc

   6. an exceptionally enjoyable event; a good time; as, the
      concert was a gas. slang
      pjc

   note: gas is often used adjectively or in combination; as,
         gas fitter or gasfitter; gas meter or gas-meter, etc.
         1913 webster

   air gas chem., a kind of gas made by forcing air through
      some volatile hydrocarbon, as the lighter petroleums. the
      air is so saturated with combustible vapor as to be a
      convenient illuminating and heating agent.

   gas battery elec., a form of voltaic battery, in which
      gases, especially hydrogen and oxygen, are the active
      agents.

   gas carbon, gas coke, etc. see under carbon, coke,
      etc.

   gas coal, a bituminous or hydrogenous coal yielding a high
      percentage of volatile matters, and therefore available
      for the manufacture of illuminating gas. --r. w. raymond.

   gas engine, an engine in which the motion of the piston is
      produced by the combustion or sudden production or
      expansion of gas; -- especially, an engine in which an
      explosive mixture of gas and air is forced into the
      working cylinder and ignited there by a gas flame or an
      electric spark.
      1913 webster
see also:
gases gasoline natural gas air gas gas battery gas carbon 
gas coke carbon coke gas coal gas engine 

[2] : The Collaborative International Dictionary of English v.0.48

carbon \car"bon\ kaumr"bo^n, n. f. carbone, fr. l. carbo
   coal; cf. skr. ,cr=a to cook. chem.
   1. an elementary substance, not metallic in its nature, which
      is present in all organic compounds. atomic weight 11.97.
      symbol c. it is combustible, and forms the base of
      lampblack and charcoal, and enters largely into mineral
      coals. in its pure crystallized state it constitutes the
      diamond, the hardest of known substances, occuring in
      monometric crystals like the octahedron, etc. another
      modification is graphite, or blacklead, and in this it is
      soft, and occurs in hexagonal prisms or tables. when
      united with oxygen it forms carbon dioxide, commonly
      called carbonic acid, or carbonic oxide, according to the
      proportions of the oxygen; when united with hydrogen, it
      forms various compounds called hydrocarbons. compare
      diamond, and graphite.
      1913 webster

   2. elec. a carbon rod or pencil used in an arc lamp; also,
      a plate or piece of carbon used as one of the elements of
      a voltaic battery.
      webster 1913 suppl.

   3. a sheet of carbon paper.
      pjc

   4. a carbon copy.
      pjc

   carbon compounds, compounds of carbon chem., those
      compounds consisting largely of carbon, commonly produced
      by animals and plants, and hence called organic compounds,
      though their synthesis may be effected in many cases in
      the laboratory.
      1913 webster

            the formation of the compounds of carbon is not
            dependent upon the life process.      --i. remsen

   carbon copy, originally, a copy of a document made by use
      of a carbon paper, but now used generally to refer to
      any copy of a document made by a mechanical process, such
      as xerographic copying.

   carbon dioxide, carbon monoxide. chem. see under
      carbonic.

   carbon light elec., an extremely brilliant electric light
      produced by passing a galvanic current through two carbon
      points kept constantly with their apexes neary in contact.
      

   carbon point elec., a small cylinder or bit of gas carbon
      moved forward by clockwork so that, as it is burned away
      by the electric current, it shall constantly maintain its
      proper relation to the opposing point.

   carbon paper, a thin type of paper coated with a
      dark-colored waxy substance which can be transferred to
      another sheet of paper underneath it by pressing on the
      carbon paper. it is used by placing a sheet between two
      sheets of ordinary writing paper, and then writing or
      typing on the top sheet, by which process a copy of the
      writing or typing is transferred to the second sheet
      below, making a copy without the need for writing or
      typing a second time. multiple sheets may be used, with a
      carbon paper placed above each plain paper to which an
      impression is to be transferred. in 1997 such paper was
      still used, particularly to make multiple copies of
      filled-in purchase invoice forms, but in most applications
      this technique has been superseded by the more faithful
      xerographic reproduction and computerized printing
      processes.

   carbon tissue, paper coated with gelatine and pigment, used
      in the autotype process of photography. --abney.

   gas carbon, a compact variety of carbon obtained as an
      incrustation on the interior of gas retorts, and used for
      the manufacture of the carbon rods of pencils for the
      voltaic, arc, and for the plates of voltaic batteries,
      etc.
      1913 webster
see also:
diamond graphite carbon compounds compounds of carbon carbon copy carbon paper 
carbon dioxide carbon monoxide carbonic carbon light carbon point 
carbon paper carbon tissue gas carbon 

Carbon >> C Words
Carbon, definition of term: Carbon
carbon_pag1.html

Carbon Monoxide >> C Words
Carbon Monoxide, definition of term: Carbon Monoxide
carbon+monoxide_pag1.html

Carbon Dioxide >> C Words
Carbon Dioxide, definition of term: Carbon Dioxide
carbon+dioxide_pag1.html

Carbon Paper >> C Words
Carbon Paper, definition of term: Carbon Paper
carbon+paper_pag1.html

Carbon Tet >> C Words
Carbon Tet, definition of term: Carbon Tet
carbon+tet_pag1.html

Carbon Tetrachl >> C Words
Carbon Tetrachl, definition of term: Carbon Tetrachl
carbon+tetrachl_pag1.html

Carbon Cycle >> C Words
Carbon Cycle, definition of term: Carbon Cycle
carbon+cycle_pag1.html

Carbon Copy >> C Words
Carbon Copy, definition of term: Carbon Copy
carbon+copy_pag1.html

Carbon 14 >> C Words
Carbon 14, definition of term: Carbon 14
carbon+14_pag1.html

Carbon Black >> C Words
Carbon Black, definition of term: Carbon Black
carbon+black_pag1.html

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